I'm assuming that the zero-cost (thus no barrier to entry) is part of the problem now. If everyone had to pay you would, at the very least, see a lot less bots and so no "chorus".
I disagree. From what I can see the problem is that people are receptive to propaganda on the internet, and you can’t really solve this. As long as this is the case, there will be people who can benefit from shifting public perception, and then it becomes merely a question of resources.